Myeloid-specific Acat1 ablation attenuates inflammatory responses in macrophages, improves insulin sensitivity, and suppresses diet-induced obesity.
In: American Journal of Physiology: Endocrinology & Metabolism, Jg. 315 (2018-09-01), Heft 3, S. E340- (17S.)
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Zugriff:
Macrophages are phagocytes that play important roles in health and diseases. Acyl-CoA:cholesterol acyltransferase 1 (ACAT1) converts cellular cholesterol to cholesteryl esters and is expressed in many cell types. Unlike global Acat1 knockout (KO), myeloid-specific Acat1 KO (Acat1-) does not cause overt abnormalities in mice. Here, we performed analyses in age- and sex-matched Acat1-M/-M and wild-type mice on chow or Western diet and discovered that Acat1-M/-M mice exhibit resistance to Western dietinduced obesity. On both chow and Western diets, Acat1-M/-M mice display decreased adipocyte size and increased insulin sensitivity. When fed with Western diet, Acat1-M/-M mice contain fewer infiltrating macrophages in white adipose tissue (WAT), with significantly diminished inflammatory phenotype. Without Acat1, the Ly6Chi monocytes express reduced levels of integrin-β1, which plays a key role in the interaction between monocytes and the inflamed endothelium. Adoptive transfer experiment showed that the appearance of leukocytes from Acat1-M/-M mice to the inflamed WAT of wild-type mice is significantly diminished. Under Western diet, Acat1-M/-M causes suppression of multiple proinflammatory genes in WAT. Cell culture experiments show that in RAW 264.7 macrophages, inhibiting ACAT1 with a small-molecule ACAT1-specific inhibitor reduces inflammatory responses to lipopolysaccharide. We conclude that under Western diet, blocking ACAT1 in macrophages attenuates inflammation in WAT. Other results show that Acat1-M/-M does not compromise antiviral immune response. Our work reveals that blocking ACAT1 suppresses diet-induced obesity in part by slowing down monocyte infiltration to WAT as well as by reducing the inflammatory responses of adipose tissue macrophages. [ABSTRACT FROM AUTHOR]
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Myeloid-specific Acat1 ablation attenuates inflammatory responses in macrophages, improves insulin sensitivity, and suppresses diet-induced obesity.
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Autor/in / Beteiligte Person: | Huang, Li-Hao ; Melton, Elaina M. ; Li, Haibo ; Sohn, Paul ; Dae Young Jung ; Tsai, Ching-Yi ; Ma, Tian ; Sano, Hiroyuki ; Ha, HyeKyung ; Friedline, Randall H. ; Kim, Jason K. ; Usherwood, Edward ; Chang, Catherine C. Y. ; Chang, Ta-Yuan |
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Zeitschrift: | American Journal of Physiology: Endocrinology & Metabolism, Jg. 315 (2018-09-01), Heft 3, S. E340- (17S.) |
Veröffentlichung: | 2018 |
Medientyp: | academicJournal |
ISSN: | 0193-1849 (print) |
DOI: | 10.1152/ajpendo.00174.2017 |
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